Anna m



(No Model.) f 2 Sheets-Sheet 1.' J. FITZGERALD, Decd.

A. M. FITZGERALD, executrix.

GRINDING MILL.

No. 285,777. Patented Sept. 25, 1883.

2 Sheets-Sheet 2.

V(No Model.)

J. FITZGERALD,v Decd.

1 A. M.F1f.\1zGfER.ALDf executrix. l GRINDING MILL. No. 285,777.Patented Sept. 25, 1888.

N. FETRs Phew-Mmmm. Washington. 0.a

y er, grinder,

"jections g. The rearward end of the'crusher outsideof the case, carriesthe pulley b.

C, and it is held in position by a collar, bf,

UNITED STATES JOHN l. FITZGERALD, OF BROOKLYN,

FATENT OFFICE.

NEW YORK, ANNA M. FITZGERALD EXECUTRIX OF SAID FTTZGERALD, DECEASED. I

cRlNolNe-MILL.

September 25, 1883,

Application filed October 24, 1882. (No model.)

0 all whom; it may concern.:

y Be it known that I, JOHN FITZGERALD, of Brooklyn, Kings county, Stateof -N ew York, and a citizen of the United States, have invented anImproved Grinding-Mill, of which the following isa full7 clear, andexact description, reference being had to the accompanying drawings,forming part of this specification.

My invention relates to a grinding-mill, and more particularly to a millfor grinding paints; and it consists of a mill composed of the parts anddevices hereinafter particularly set forth and described, and recited inthe claim.

Figure l is an elevation in perspective of a mill embodying myinvention. Fig. 2 is a vertical longitudinal section of the same. Fig. 3is a similar cross-section; and Fig. 4 is a lon gitudinal sectional viewofthe crusher, grinder, and bolting-cylinder in detail.

At A is shown the mill-frame,.which is composed of substantial timbersand -braces to support the machinery, and of casing or panelwork, and asuitable iiooringand roof, so as to constitute a closed case for theentire machine.

B is the single driving-shaft of the apparatus, upon which the movingparts of the crushand bolter are mounted. This shaft has a bearing atthe rearward4 end in a box set in the frame, and on its rear extremity,

The shaft is set at an incline downwardly from the front to the rear endof the machine, and at its forward end it has bearing in a box or hub onor forming part of the case of the crusher beyond said hub, as shown.

The crusher C is a cylindrical casting, having wide flanges C and C2 atits ends, and it is mounted rigidly on the mill-frame, with shaft Bpassing through it longitudinally and concentric to said shaft. At itsupper side, outside the mill-frame, is the hopper-opening c,

into which'the hopper H may sit. On its interior face it has the ribs orprojections o', while interiorly of C is the long sleeve G, keyed toshaft B, and provided with the ribs or pro- O extends within the casingor frame A, and its iiange C constitutes a part of the grinding device,the exposed rearward face thereof being in contact, or nearly so, withthe similar face of a disk, D, which is keyed at its hub d to the shaftB. The iiange C is thus the stationary grinder and the disk D the movinggrinder. l

l F is the bolting-cylinder, the sides of which are formed of gauze orother suitable bolting material stretched upon a frame-work, f, andhaving the closed ends f This cylinder is mounted in the mill-frame, andis arranged concentric with the shaft B, so that itis inclineddownwardly from front to rear end. The ends f have circumferentialgrooves f2, fitting upon corresponding ways, a7, on the mill-frame, bywhich means the cylinder may be rotated more or less in the mill-frame,so that if the gauze or bolting-cloth becomes worn or clogged along thebottom of the cylinder the worn or clogged portion may be thrown upwardto one side orthe other, and another part of `the gauze become thebottom. The bolting cylinder incloses the grinders C D at the forwardend, so that the material coming from the crusher and the grinder fallsdirectly-into the boltingcylinder, while in the head f,`at the rear endof the cylinder, is an opening, a, through which the tailings fall intoa suitable chamber, A?, in the mill-case.

E are scrapers or brushes, which extend longitudinally of the interiorof the bolting-cylinder, and are clamped into seats e,whicl1` aremounted, by swivel-joints e on the outward ends of radial arms c3, whichare screwed into hubs e, keyed to the shaft B. The arms have thejam-nuts et Any wear upon the brushes may be compensated by lengtheningthe arms e3 by means of their screw-seats in hubs e, the jam-nutskeeping the arms in desired position.

A mill is thus constructed in which all the moving parts are mounteddirectly upon and driven by the single shaft B, and in which thematerial to be ground and'bolted, being introduced into the crusher at@,will pass thence to the grinders, and thence will fall directly intothe bolting-cylinder, and the bolted stuft` will be thrown through thecylinder F into the chamber A in the mill-case A, while the tailingswill escape at c into the separate chamber A2,F and the entireIapparatus being entirely inclosed by the casing A, all dust from theoperative parts will be confined wit-hin the roo ` casingand preventedfrom escaping into the l room in which the machine is employed. Ingrinding and bolting the dry materials for use in the manufacture ofpaints this is a result greatly to be desired, as some of thesematerials evolve a large quantity of dust in the grinding and handling,which is very injurious to the operatives.

I do not claim as new in a grinding-mill a pair of grinding disks orstones, vertically arranged, located within a bolting-cylinder and onthe same shaft therewith, the Whole being surrounded by aninclosing-casing; nor

a pair of vertical grinding-disks with a crusher attachment, as I amaware that such devices, broadly, are now in use. I desire and intend tolimit my claim hereunder to a grindingmill composed of the speciiicdevices hereinbefore described, and as recited in the claims,

2o constructed and arranged relatively to each other, as hereinparticularly set forth.

Y ing the grinders,

That I claim as my invention, and desire to secure by Letters Patent, is

A mill composed of the inclosing-easing and frame A, forming chambers Aand A, the inclined driving-shaft B, the stationary crusher-cylinder C,carrying iiange C', constituting the stationary grinder, the revolvingCrushersleeve G, the movable grinder D, the boltingcylinder F, with itsclosed ends f', and inelosand the revolving brushes E, as described,said crusher cylinder and its ilange and the bolting-cylinder beingmounted on the mill-frame, and said Crusher-sleeve, movable grinder, andbolting-bruslies being keyed to the single driving-shaft, all as and forthe purpose specified.

JOHN FITZGERALD;

lNitnesses:

A. G. N. VERMILYA, A. S. FITCH.

